Department of Biology and Earth Sciences, Section Biology, Regional Centre for Careers in Education and Training CRMEF Marrakech-Safi, Ibn Rochd, Marrakesh 40 000, Morocco.
Department of Biology, Laboratory of Water, Biodiversity and Climate Change, Parasitology and Aquatic Biodiversity, Faculty of Sciences-Semlalia, University Cadi Ayyad Marrakesh , Morocco.
Int J Environ Health Res. 2022 Jul;32(7):1594-1608. doi: 10.1080/09603123.2021.1898551. Epub 2021 Mar 16.
The current study aimed to determine the contamination level by human parasite eggs and cysts of sewage-irrigated soil, food crops and fodder crops. Field trials were conducted on spray-irrigated lettuce and flood-irrigated crops using raw wastewater and fresh water. Findings showed that irrigation by raw wastewater led to crops contamination with parasite eggs and cysts in varying levels. Lettuce samples were positive (27.7%) for one or more helminth eggs including the pathogens and with an average of 4.7 eggs/kg. Wastewater application caused an increase in lettuce contamination, followed by a decreasing phase. Cessation of irrigation resulted in helminth eggs disappearance within a week. Flood-irrigated crops were contaminated with helminth eggs in levels ranging from 1.5 eggs/kg in alfalfa to 4.75 eggs/kg in coriander. The pathogenic and commensal amoeba cysts were highly detected reaching 9.97x10 cysts/kg in alfalfa. Parasites highly concentrated in soil, with levels up to 159 eggs/100gdw and 1.3x10 cysts/gdw. and eggs developed in soil and crops attaining the infective stage. Crops and soil irrigated with fresh water were free from parasite eggs and cysts. The occurrence of pathogens in soil and crops implies health risks for farmers, produce handlers and consumers.
本研究旨在确定污水灌溉土壤、食物作物和饲料作物中人体寄生虫卵和包囊的污染水平。对采用污水和淡水进行喷灌的生菜和水培作物进行了田间试验。结果表明，污水灌溉导致作物受到不同程度的寄生虫卵和包囊污染。生菜样品中存在一种或多种寄生虫卵呈阳性，包括病原体 和 ，平均每公斤 4.7 个卵。污水灌溉导致生菜污染增加，随后进入下降阶段。停止灌溉后，一周内寄生虫卵消失。洪水灌溉的作物受到寄生虫卵的污染，从苜蓿中的 1.5 个卵/公斤到芫荽中的 4.75 个卵/公斤不等。致病性 和共生性阿米巴包囊的检出率很高，在苜蓿中达到 9.97x10 个包囊/公斤。寄生虫在土壤中高度集中，含量高达 159 个卵/100gdw 和 1.3x10 个包囊/gdw。 和 在土壤和作物中发育到感染阶段。用淡水灌溉的作物和土壤中没有寄生虫卵和包囊。病原体在土壤和作物中的存在意味着农民、农产品处理者和消费者面临健康风险。
